java.lang.Object
- java.awt.image.ImageFilter
- - java.awt.image.ReplicateScaleFilter
  - - java.awt.image.AreaAveragingScaleFilter

All Implemented Interfaces:

ImageConsumer, Cloneable
```
public class AreaAveragingScaleFilter
extends ReplicateScaleFilter
```
An ImageFilter class for scaling images using a simple area averaging algorithm that produces smoother results than the nearest neighbor algorithm.
This class extends the basic ImageFilter Class to scale an existing image and provide a source for a new image containing the resampled image. The pixels in the source image are blended to produce pixels for an image of the specified size. The blending process is analogous to scaling up the source image to a multiple of the destination size using pixel replication and then scaling it back down to the destination size by simply averaging all the pixels in the supersized image that fall within a given pixel of the destination image. If the data from the source is not delivered in TopDownLeftRight order then the filter will back off to a simple pixel replication behavior and utilize the requestTopDownLeftRightResend() method to refilter the pixels in a better way at the end.
It is meant to be used in conjunction with a FilteredImageSource object to produce scaled versions of existing images. Due to implementation dependencies, there may be differences in pixel values of an image filtered on different platforms.

See Also:
FilteredImageSource, ReplicateScaleFilter, ImageFilter

Field Summary
- Fields inherited from class java.awt.image.ReplicateScaleFilter destHeight, destWidth, outpixbuf, srccols, srcHeight, srcrows, srcWidth
- Fields inherited from class java.awt.image.ImageFilter consumer
- Fields inherited from interface java.awt.image.ImageConsumer COMPLETESCANLINES, IMAGEABORTED, IMAGEERROR, RANDOMPIXELORDER, SINGLEFRAME, SINGLEFRAMEDONE, SINGLEPASS, STATICIMAGEDONE, TOPDOWNLEFTRIGHT

Constructor Summary

Constructors
Constructor and Description
`AreaAveragingScaleFilter(int width, int height)` Constructs an AreaAveragingScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.

AreaAveragingScaleFilter (Java Platform SE 7 ) Home of API Java Contents Haut

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`setHints(int hints)` Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work.
`void`	`setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)` Combine the components for the delivered byte pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete.
`void`	`setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)` Combine the components for the delivered int pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete.

AreaAveragingScaleFilter (Java Platform SE 7 ) Home of API Java Contents Haut

Methods inherited from class java.awt.image.ReplicateScaleFilter setDimensions, setProperties

Methods inherited from class java.awt.image.ImageFilter clone, getFilterInstance, imageComplete, resendTopDownLeftRight, setColorModel

Methods inherited from class java.lang.Object equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AreaAveragingScaleFilter
    public AreaAveragingScaleFilter(int width, int height)
    
    Constructs an AreaAveragingScaleFilter that scales the pixels from its source Image as specified by the width and height parameters.
    
    Parameters:
    width - the target width to scale the image
    height - the target height to scale the image
- Method Detail
  - setHints
    public void setHints(int hints)
    
    Detect if the data is being delivered with the necessary hints to allow the averaging algorithm to do its work.
    Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.
    
    Specified by:
    
    setHints in interface ImageConsumer
    
    Overrides:
    
    setHints in class ImageFilter
    
    Parameters:
    hints - a set of hints that the ImageConsumer uses to process the pixels
    See Also:
    ImageConsumer.setHints(int)
  - setPixels
    public void setPixels(int x, int y, int w, int h, ColorModel model, byte[] pixels, int off, int scansize)
    
    Combine the components for the delivered byte pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete. If the correct hints were not specified in the setHints call then relay the work to our superclass which is capable of scaling pixels regardless of the delivery hints.
    Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.
    
    Specified by:
    
    setPixels in interface ImageConsumer
    
    Overrides:
    
    setPixels in class ReplicateScaleFilter
    
    Parameters:
    x - the X coordinate of the upper-left corner of the area of pixels to be set
    y - the Y coordinate of the upper-left corner of the area of pixels to be set
    w - the width of the area of pixels
    h - the height of the area of pixels
    model - the specified ColorModel
    pixels - the array of pixels
    off - the offset into the pixels array
    scansize - the distance from one row of pixels to the next in the pixels array
    See Also:
    ReplicateScaleFilter
  - setPixels
    public void setPixels(int x, int y, int w, int h, ColorModel model, int[] pixels, int off, int scansize)
    
    Combine the components for the delivered int pixels into the accumulation arrays and send on any averaged data for rows of pixels that are complete. If the correct hints were not specified in the setHints call then relay the work to our superclass which is capable of scaling pixels regardless of the delivery hints.
    Note: This method is intended to be called by the ImageProducer of the Image whose pixels are being filtered. Developers using this class to filter pixels from an image should avoid calling this method directly since that operation could interfere with the filtering operation.
    
    Specified by:
    
    setPixels in interface ImageConsumer
    
    Overrides:
    
    setPixels in class ReplicateScaleFilter
    
    Parameters:
    x - the X coordinate of the upper-left corner of the area of pixels to be set
    y - the Y coordinate of the upper-left corner of the area of pixels to be set
    w - the width of the area of pixels
    h - the height of the area of pixels
    model - the specified ColorModel
    pixels - the array of pixels
    off - the offset into the pixels array
    scansize - the distance from one row of pixels to the next in the pixels array
    See Also:
    ReplicateScaleFilter

Document created the 11/06/2005, last modified the 04/03/2020
Source of the printed document:https://www.gaudry.be/en/java-api-rf-java/awt/image/areaaveragingscalefilter.html

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References

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Class AreaAveragingScaleFilter

References